# Edit an update

`PATCH https://evohub.io/api/v1/maintenance-windows/{id}/updates/{updateID}`

Part of the [On-Call API](https://docs-dev.evohub.io/oncall.md) reference · operationId `editMaintenanceUpdate`.

Replaces an update's text, on the status page too when it was posted there.

**Permission (API-key scope):** `oncall:maintenance:write`.

## Authorization

Any one of:

- `bearerAuth` (oncall:maintenance:write)
- `apiKeyHeader` (oncall:maintenance:write)

Where:

- `bearerAuth`: HTTP Bearer — An EvoHub API key (`evohub_…`) as a bearer token.
- `apiKeyHeader`: API key in the header `X-API-Key` — An EvoHub API key (`evohub_…`).

## Path parameters

- `id` (string, required, example `c1d2e3f4-a5b6-4c7d-8e9f-0a1b2c3d4e5f`): The maintenance window's id.
- `updateID` (string, required, example `d5e6f7a8-b9c0-4d1e-a2f3-b4c5d6e7f8a9`): The update's id.

## Request body (required)

Content type: `application/json`

Type: `UpdateBody`

- `body` (string, required, min length 1)

## Responses

### 200 — The update after the change.

Content type: `application/json`

Type: `object`

- `data` (MaintenanceUpdate, required)
  - `id` (string)
  - `window_id` (string)
  - `author_id` (string)
  - `body` (string)
  - `created_at` (string (date-time))
- `success` (boolean, required, value `true`)

### 400 — The body is not JSON (`INVALID_BODY`) or `body` is empty (`VALIDATION_ERROR`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 401 — No API key was sent, or it is unknown, revoked or expired (`UNAUTHORIZED`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 403 — The key lacks the scope this endpoint needs (`FORBIDDEN`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 404 — No such update on this window (`NOT_FOUND`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 429 — Too many requests (`RATE_LIMITED`). Wait `Retry-After` seconds.

Headers:

- `Retry-After` (integer): Seconds to wait.

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

### 500 — Something went wrong on EvoHub's side (`INTERNAL_ERROR`). Retry later.

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required): Machine-readable code. Branch on this.
  - `message` (string, required): Human-readable explanation.

## Example request

```bash
curl -X PATCH 'https://evohub.io/api/v1/maintenance-windows/c1d2e3f4-a5b6-4c7d-8e9f-0a1b2c3d4e5f/updates/d5e6f7a8-b9c0-4d1e-a2f3-b4c5d6e7f8a9' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <TOKEN>' \
  -d '{
  "body": "Replica promoted; traffic switched."
}'
```